An investigation was made of the (110) surface by using He atom scattering methods. It was shown that the 1 x 2 deconstruction transition at 1087K fell into the 2-dimensional Ising universality class, with antiphase domain walls proliferating mainly along the [001] direction. Surface roughening was detected at 1160K, due to a power-law broadening of the antiphase diffraction peak along the [001] direction. The 2 phase transitions limited the temperature range within which the surface was disordered but was still confined to a common height level.

D.Cvetko, V.De Renzi, L.Floreano, A.Morgante, F.Tommasini: Solid State Communications, 1994, 91[7], 539-43