(a) Side view of the heterostructure with graphene on a (001) RbMnCl₃ surface. The C, Rb, Mn, and Cl atoms are denoted in brown, purple, red, and green, respectively. (b) Top view of the heterostructure with the topmost layer Mn atoms of the MnRbCl₃ located at the hollow site of graphene. For clarity, only graphene and the topmost layer Mn atoms are displayed. (c) The reciprocal momentum space structures for the 1 × 1 and 3 × 3 supercells of graphene, where b_1,2 and are the reciprocal vectors of the 1 × 1 and 3 × 3 supercells, respectively. K and K′ points of the 3 × 3 supercell of graphene are folded into the Γ point. Reprinted with permission from Ref. [17]. Copyright 2015 by Nature Publication Group.