A. R. Smith, R. M. Feenstra
Department of Physics, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213
D. W. Greve
Department of Electrical and Computer Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213
M.-S. Shin, M. Skowronski
Department of Materials Science and Engineering, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213
J. Neugebauer
Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin, Germany
J. E. Northrup
Xerox Palo Alto Research Center, 3333 Coyote
Hill Road, Palo Alto, California 94304
Published in Surf. Sci. 423, 70 (1999).