microscopy and synchrotron-radiation photoemission. While our data are in broad
agreement with the structural model of GaAs (311) A proposed in a recent study
[Wassermeier et al., Phys. Rev. B 51, 14 721 (1995)], we find considerable differences in the
surface order. In particular, the As dimer rows are unbroken over much shorter length scales
and are highly kinked. We observe a correspondingly lower degree of anisotropy in the …