An electrolytic copper foil for synthesis of a single-layer graphene thin film, wherein a Rz roughness of an S-face of the electrolytic copper foil after thermal-treatment is define based on a following Relationship 1: Relationship 1: 0.05 < (Rz roughness of an M-face of the electrolytic copper foil/Rz roughness of the S-face after the thermal-treatment)/thickness of the electrolytic copper foil < 0.2, wherein the thermal treatment is carried out at a temperature of 180 to 220 degrees Celsius for 50 to 80 minutes, [[and]] SVG 16088840.06-18-2020.KBM₇₁T₄BLXEAPX1.CLM.1.svg 0.15 5.83 Black and white graphene thin film that is s y nthesized on the electrolytic copper foil is 300 0/square or smaller; and wherein the Rz roughness of the S-face of the electrol y tic copper foil is 1.2-1.4 u m after a thermal-treatment performed at 200 * C for 1 hour in a synthesis of g raphene on the electrolytic copper foil. Currently amended

Canceled

5-8. Canceled

Canceled in the Relationship 1, the Rz roughness of the pm. Currently amended in the Relationship 1, the thickness of the amended

An electrolytic copper foil for synthesis of a single-layer graphene thin film, wherein a Rz roughness of an S-face of the electrolytic copper foil after thermal-treatment is define based on a following Relationship 1: Relationship 1: 0.05 < (Rz roughness of an M-face of the electrolytic copper foil/Rz roughness of the S-face after the thermal-treatment)/thickness of the electrolytic copper foil < 0.2, wherein the thermal treatment is carried out at a temperature of 180 to 220 degrees Celsius for 50 to 80 minutes, [[and]] SVG 16088840.06-18-2020.KBM₇₁T₄BLXEAPX1.CLM.1.svg 0.15 5.83 Black and white graphene thin film that is s y nthesized on the electrolytic copper foil is 300 0/square or smaller; and wherein the Rz roughness of the S-face of the electrol y tic copper foil is 1.2-1.4 u m after a thermal-treatment performed at 200 * C for 1 hour in a synthesis of g raphene on the electrolytic copper foil. Currently amended

Canceled

5-8. Canceled

Canceled in the Relationship 1, the Rz roughness of the pm. Currently amended in the Relationship 1, the thickness of the amended

An electrolytic copper foil for synthesis of a single-layer graphene thin film, wherein a Rz roughness of an S-face of the electrolytic copper foil after thermal-treatment is define based on a following Relationship 1: Relationship 1: 0.05 < (Rz roughness of an M-face of the electrolytic copper foil/Rz roughness of the S-face after the thermal-treatment)/thickness of the electrolytic copper foil < 0.2, wherein the thermal treatment is carried out at a temperature of 180 to 220 degrees Celsius for 50 to 80 minutes, [[and]] SVG 16088840.06-18-2020.KBM₇₁T₄BLXEAPX1.CLM.1.svg 0.15 5.83 Black and white graphene thin film that is s y nthesized on the electrolytic copper foil is 300 0/square or smaller; and wherein the Rz roughness of the S-face of the electrol y tic copper foil is 1.2-1.4 u m after a thermal-treatment performed at 200 * C for 1 hour in a synthesis of g raphene on the electrolytic copper foil. Currently amended

Canceled

5-8. Canceled

Canceled in the Relationship 1, the Rz roughness of the pm. Currently amended in the Relationship 1, the thickness of the amended

An electrolytic copper foil for synthesis of a single-layer graphene thin film, wherein a Rz roughness of an S-face of the electrolytic copper foil after thermal-treatment is define based on a following Relationship 1: Relationship 1: 0.05 < (Rz roughness of an M-face of the electrolytic copper foil/Rz roughness of the S-face after the thermal-treatment)/thickness of the electrolytic copper foil < 0.2, wherein the thermal treatment is carried out at a temperature of 180 to 220 degrees Celsius for 50 to 80 minutes, [[and]] SVG 16088840.06-18-2020.KBM₇₁T₄BLXEAPX1.CLM.1.svg 0.15 5.83 Black and white graphene thin film that is s y nthesized on the electrolytic copper foil is 300 0/square or smaller; and wherein the Rz roughness of the S-face of the electrol y tic copper foil is 1.2-1.4 u m after a thermal-treatment performed at 200 * C for 1 hour in a synthesis of g raphene on the electrolytic copper foil. Currently amended

Canceled

5-8. Canceled

Canceled in the Relationship 1, the Rz roughness of the pm. Currently amended in the Relationship 1, the thickness of the amended