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We grew 20-100 nm thick films of B20 FeGe by molecular beam epitaxy andinvestigated the surface structures via scanning tunneling microscopy. Weobserved the atomic resolution of each of the four possible chemical layers inFeGe(-1-1-1). An average hexagonal surface unit cell is observed via scanningtunneling microscopy, low energy electron diffraction, and reflection highenergy electron diffraction resulting in a size of ~6.84 {\AA} in agreementwith the bulk expectation. Furthermore, the atomic resolution and registryacross triple-layer step edges definitively determine the grain orientation as(111) or (-1-1-1). Further verification of the grain orientation is made by Ar+sputtering FeGe(-1-1-1) surface allowing direct imaging of the subsurfacelayer.

Surface Structures of Epitaxial B20 FeGe(-1-1-1) Thin Films via Scanning Tunneling Microscopy