Figure 1: SnTe lattice and Brillouin zone.
From: Topological crystalline insulators in the SnTe material class
(a) the crystal structure of SnTe; (b) the face-centered-cubic (FCC) Brillouin zone showing the plane ΓL1L2, which is invariant under reflection about the (110) axis and projects onto the 
line in the [001] surface.
