Hand-built Janus 2H-MoSH monolayer initial structure. P3m1, a=3.18 A (MDPI Molecules 29, 3554 2024), 20 A vacuum; z-heights initialized from MoS2 prototype (S +1.561 A, H -0.80 A) for subsequent MLIP relaxation. Validated: 3 sites, ordered, Mo-S 2.410 A, Mo-H 2.003 A, frac coords in range.