An investigation was made of the 3 x 2 structure, on a (113) clean surface, by using scanning tunnelling microscopy. The results were compared with theoretical images that were obtained by using 2 proposed geometrical models. One of these models could almost account for the present images. A high density of surface defects was observed on (113), and their structures were deduced on the basis of scanning tunnelling microscopic images.

H.Sakama, D.Kunimatsu, M.Kageshima, A.Kawazu: Physical Review B, 1996, 53[11], 6927-30