Abstract
From the scanning tunneling microscopy STM image of reconstructed Si 5 5 12 surface, a well-defined facet, not existing between 001 and 111 , has been found in addition to the well-known 113 facet. With the help of known dimensions of 113 and 5 5 12 surfaces, it has been identified as a 6 9 17 facet via analyzing STM images and its corresponding bulk-terminated model. The 6 9 17 facet turns out to be composed of a 337 terrace and 011 steps. Through forming an anisotropic triangle composed of 5 5 12 , 113 , and 6 9 17 surfaces in the stereogram, it becomes possible to understand the origin of two kinds of facet shapes existing on the reconstructed Si 5 5 12 surface. These are a saw-toothlike facet and a smoothly bending facet depending upon the local orientations inside and outside the anisotropic triangle in the stereogram, respectively.
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