Scanning tunneling microscopy reveals that Si(112) reconstructs into quasiperiodic, nanometer-scale facets. Each sawtoothlike facet consists of a single unit cell wide reconstructed (111) terrace (7×7 or 5×5) opposed by a 60 to 110 Å wide (337) terrace. Nanofacets with a similar structure are also observed on Si(335), indicating that they are a general phenomenon for some range of vicinality towards [$\overline{1}\overline{1}2$] The dimensions of these nanofacets suggest that Si(112) and Si(335) would be interesting substrates for the growth of corrugated superlattices.

• Received 26 September 1994

DOI:https://doi.org/10.1103/PhysRevLett.74.956