C14 MgZn2-type CIF for MnFeSi layered ordering (Mn at 2a(0,0,0), Fe at 2a(0,0,1/2)) — SG 194 P6₃/mmc, placeholder lattice a=5.00Å, c=8.10Å. Tests whether Mn/Fe layer alternation along c-axis is energetically preferred.