Multi-layer atomic coordinates for the (¯1¯1¯1)-(2 x 2) surface were determined by using automated tensor low-energy electron diffraction. The results confirmed the As adatom trimer model which was based upon total-energy calculations and scanning tunnelling microscopy, although the details of the displacements were different. The low-energy electron diffraction analysis, being sensitive to multi-layer spacings in the surface region, showed that substantial sub-surface relaxation occurred.

Multilayer structural determination of the GaAs(¯1¯1¯1)-(2 x 2) reconstruction by automated tensor LEED B.C.Deng, Z.X.Yu, G.Xu, B.J.Mrstik, S.Y.Tong: Physical Review B, 1999, 59[15], 9775-8