Abstract
Solid-on-solid models provide a comprehensive description of surface roughening, preroughening, and reconstruction. The origin and properties of the preroughening transition and disordered flat (DOF) phase are reviewed. The present experimental evidence for realizations of DOF phases in (110) facets of face-centered cubic (FCC) metals and in (111) facets of noble gas crystals is discussed. A chiral 4-state clock-step model is introduced to describe the deconstruction and roughening of missing row reconstructed (110) facets of FCC crystals. It is shown that a reconstructed rough phase is not possible. Instead roughening induces a simultaneous deconstruction transition, with central charge c=1.5 and both Ising and conventional roughening critical exponents. This, together with the experimental evidence suggests that at deconstruction Pt(110) becomes rough and simultaneously undergoes an incommensurate melting transition with respect to its reconstruction degrees of freedom.
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