Where are the Sn atoms in LaSb2Snx, 0.1⩽x⩽∼0.75?

Shows the top of an LaSb2 bi-layer along with the (010) plane of Sn atoms immediately above it viewed in the ac-plane. The Sb(2) atoms are white while the Sn atoms are black. The incommensurate relationship between the LaSb2 and Sn component sub-structures of composite modulated LaSb2Snx along the c direction is clearly visible.