Reflectance difference spectroscopic studies were made of highly-oriented mono-domain 2 x 1 reconstructed (001) surfaces. It was found that these were much closer to the so-called ideal surface than was the vicinal one that was commonly used in reflectance difference spectroscopy. It was prepared by using an electromigration technique which resulted in large (5μ) terraces. Certain features that were attributed to 2 x 1 and 2 x 2 structures were significantly different in spectra from vicinal surfaces; this indicating that the steps suppressed formation of 2 x 2 structures.

R.Shioda, J.Van der Weide: Physical Review B, 1998, 57[12], R6823-5