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A convenient scheme is presented for calculating potential energy of van derWaals interacting bilayer graphene and other similar 2D compounds. It is basedon the notion of the existence of two types of local symmetry of carbon atomsordering, a 3- and 6-fold one. Potential energy of an atom is expressed as asum of contributions from rings of equidistant atoms on neighboring layer.Methods are described to compute the radius of rings of equidistant atoms andnumber of atoms they contain. Exact positions of atoms are found as well,allowing to apply the introduced method in modelling of anisotropic potentialsand to be used when twisting between layers is present.

Number of equidistant neighbors on honeycomb lattice