No abstract

On p. 1949, first column, first and second lines, we stated that the trends in line shifts due to surface photovoltage observed for Ag/CdTe(100) by John et al. ' are contrary to the expectation based on substrate doping, and that this point was not elaborated on by the authors. We have overlooked that John et al. did, in fact, realize the opposite direction of the observed shifts, and provided an explanation for the trends in the shifts in terms of charge accumulation in the Ag clusters on the CdTe surface. We regret the misrepresentation of the discussion of results in the paper by John et al. An equally likely explanation for the observations by John et al. might be a change in substrate doping at the surface brought about by the sputtering and annealing process which was used to prepare a clean surface, which would provide an explanation for the observed shifts through a surface photovoltage induced by the synchrotron light, as explained in more detail in our paper.

Low-energy reflectivity of electrons from single-and multi-layer graphene is examined both theoretically and experimentally. A series of minima in the reflectivity over the energy range of 0 -8 eV are found, with the number of minima depending on the number of graphene layers. Using first-principles computations, it is demonstrated that a free standing n-layer graphene slab produces 1  n reflectivity minima. This same result is also found experimentally for graphene supported on SiO 2 . For graphene bonded onto other substrates it is argued that a similar series of reflectivity minima is expected, although in certain cases an additional minimum occurs, at an energy that depends on the graphene-substrate separation and the effective potential in that space.

The ordered domain patterns that form spontaneously in a wide variety of chemical and physical systems as a result of competing interatomic interactions can be used as templates for fabricating nanostructures. Here we describe a new self-assembling domain pattern on a solid surface that involves two surface structures of lead on copper. The evolution of the system agrees with theoretical predictions, enabling us to probe the interatomic force parameters that are crucial to the process.