High-resolution low-energy electron diffraction was used to characterize the high-index surface, (112), after repeated high-temperature thermal cycling around 2150C. Random steps with a monatomic step height, surface misorientations, and mosaic structures were observed. The Bragg peak position of the diffraction beam from a particular micro-grain oscillated along the 2-dimensional reciprocal rod. The oscillation was interpreted in terms of the scattering of the electron from a surface with a small misorientation angle with respect to the (112) plane. A single grain with no misorientation, and having an ordered region with an extent of several hundred Angstrom units, existed at the surface.

J.K.Zuo, G.C.Wang: Surface Science, 1988, 194[1-2], L77-86