The surface atomic structure of Bi on Au(111) was studied with scanning tunneling microscopy. At about 0.5 monolayer of Bi, a well-ordered 6 x 6 atomic structure was observed. The structure had three notable features: corner holes, Bi adatoms, and stacking faults, very similar to a semiconductor surface of Si(111)-7x7. Out of 18 Bi surface atoms in a unit cell, 6 atoms were at hollow sites and were adatoms, and another 6 atoms were near-bridge sites. The last 6 atoms surrounded corner holes and were lower, than other surface atoms, by about 0.2Å. A possible atomic model was proposed, based upon these observations.

Corner Hole Adatom Stacking Fault Structure of Bi on Au(111). J.H.Jeon, K.H.Chung, H.Kim, S.J.Kahng: Surface Science, 2009, 603[1], 145-50