Fig. 1. Schematic illustration of the emergence of RMC as a result of the mutual orientations between A2 (red arrows) and MoS₂ (green arrows).

(A) Computer-generated atomic models of monolayer MoS₂ with a mirror grain boundary. (B) Schematic representations of the dissimilar atomic configurations where S contrast degrades on LHS, and enhancement in S contrast is observed on RHS. (C) Simulation of HR-STEM ADF imaging for the atomic models in (A) with A2 applied.