1. Sandia National Laboratories, Albuquerque, New Mexico 87185-1413, Institute of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark, Center for Atomic-Scale Materials Physics, Department of Physics, Technical University of Denmark, DK-2800 Lyngby, Denmark, Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, D-14195 Berlin-Dahlem, Germany, Motorola Corporation, Computational Materials Group, Sandia National Laboratories, Albuquerque, New Mexico 87185-1415, and Department of...