Chen, D. M.Golovchenko, JeneBedrossian, P.Mortensen, K.2016-11-181988Chen, D. M., J. A. Golovchenko, P. Bedrossian, and K. Mortensen. 1988. Tunneling Images of Gallium on a Silicon Surface: Reconstructions, Superlattices, and Incommensuration. Physical Review Letters 61, no. 25: 2867-2874. doi:10.1103/physrevlett.61.2867.0031-9007http://nrs.harvard.edu/urn-3:HUL.InstRepos:29407037Real-space images of an incommensurate superlattice on a monolayer-gallium-covered silicon (111) surface have been obtained with the tunneling microscope. Large, internally ordered supercells which in turn form a lattice with discrete boundaries are observed. A graphitelike silicon-gallium top layer is suggested that is weakly bonded to the lattice below and stabilized by a periodic array of misfit dislocations. This model unifies reflection high-energy electron diffraction, x-ray standing-wave, and tunneling observations.en-USJournal Article2016-11-1810.1103/PhysRevLett.61.2867