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In recent years substantial progress has been made in the detection of surface phonons owing to considerable improvements in inelastic rare gas scattering techniques and electron energy loss spectroscopy. With these methods it has become possible to measure surface vibrations in a wide energy range for all wave vectors in the two-dimensional Brillouin zone and thus to deduce the complete surface phonon dispersion curves. Inelastic atomic beam scattering and electron energy loss spectroscopy...