Table 1. Average global surface roughness of Cu film across 120×160 μm² surfaces, coverage of transferred graphene measured by SEM image and image processing software, and monolayer-bilayer coverage processed by analyzing three sets of Raman map data from each Cu-Ni thicknesses.

Cu thickness in Cu-Ni (nm)	Global1 roughness (nm)	Coverage2 (transferred, %)	Monolayer3 coverage (% of Coverage)	>Bilayer3 coverage (% of Coverage)
100	96	46	95	5
150	50	78	99	1
200	55	88	96	4
250	53	97	97	3
500	69	94	80	20
750	54	98	74	26
1000	58	97	56	44

¹Optical profilometer

²Measurement by SEM

³Measurement by Raman