TABLE I.

Summary of $\mid {\mathcal{S}}_b{\mid }^2$, the square of the relative structure factor, for various graphene stackings. The designations ‘weak’ (e.g. 1^st) and ‘strong’ (e.g. 2^nd) order are shorthand for (v₁ + v₂) mod 3 ≠ 0 and = 0 respectively.

Stacking	Condition	weak order	strong order
AA	n.a.	N 2	4N2
AB	N is odd N is even	(N2 + 3)/4 N2/4
ABC	N mod 3 ≠ 0 N mod 3 = 0	1 0