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The surface structures of different Ca/Si͑111͒ surfaces were studied by low-energy electron diffraction ͑LEED͒ and high-resolution core-level photoelectron spectroscopy. Five different phases were observed in LEED depending on the Ca coverage. The lowest coverage phase has both (3ϫ2) and c(6ϫ2) periodicities, and the highest coverage phase has a (2ϫ1) periodicity. The LEED patterns of the three intermediate phases were (5ϫ2), (7ϫ1), and (9ϫ1). In the Si 2p core-level spectra, three surfacedoi:10.1103/physrevb.66.165319 fatcat:qjqtbwo5xrdd3ka27mczlo6a4q