The carbon's solubility into copper is amazingly low and therefore mainly surface diffusion and nucleation of carbon atoms are involved. For that reason and the growth kinetics, the graphene thickness is restricted to predominantly a monolayer. The large benefit is that the graphene is usually developed on Cu foil and https://www.quora.com/profile/Trevor-Flatcher-2/The-Versatile-Applications-of-Silicon-Carbide-Special-Ceramics-in-Modern-Industries-Silicon-carbide-SiC-special-ceram