The carbon's solubility into copper is incredibly lower and for that reason largely floor diffusion and nucleation of carbon atoms are included. Due to this as well as growth kinetics, the graphene thickness is restricted to predominantly a monolayer. The large edge would be that the graphene is often grown https://www.quora.com/profile/Trevor-Flatcher-2/Silicon-Carbide-in-wind-power-equipment-applications-Silicon-Carbide-in-Wind-Power-Equipment-Applications-Silicon-Carb