Crystalline Bilayer Graphene with Preferential Stacking from Ni-Cu Gradient Alloy

Zhaoli Gao, Qicheng Zhang, Carl H. Naylor, Youngkuk Kim, Irfan Haider Abidi, Jinglei Ping, Pedro Ducos, Jonathan Zauberman, Meng Qiang Zhao, Andrew M. Rappe, Zhengtang Luo, Li Ren, Alan T.Charlie Johnson