Janus WSSe monolayer (P3m1) — Liu et al. PBE geometry

Janus WSSe monolayer, a=3.248 A, S-Se vertical thickness 3.251 A (Liu et al., AI Materials 1(1):4, 2026, DOI 10.3390/aimater1010004, PBE); W-S/W-Se vertical splits from literature bond lengths (CPL 40, 087201); 18.5 A vacuum