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• W2086143743 endingPage "4728" @default.
• W2086143743 startingPage "4721" @default.
• W2086143743 abstract "Experimental reflection high-energy electron-diffraction (RHEED) rocking curves in the [1ifmmodebarelsetextasciimacronfi{}10] azimuth from the molecular-beam-epitaxy (MBE) grown As-rich GaAs(001)2ifmmodetimeselsetexttimesfi{}4 surface have been analyzed by fitting rocking curves computed using elastic multiple-scattering (dynamical) theory. The surface is assumed to be composed of unit cells having the ``missing row'' structure in which the 2ifmmodetimeselsetexttimesfi{} periodicity arises from symmetrically dimerized As atoms and the 4ifmmodetimeselsetexttimesfi{} periodicity from a regular array of missing dimers, such that the As surface coverage is three-quarters of a monolayer. The surface model permits relaxation in both the surface layer (As) and the second layer (Ga). The best fit to the experimental data occurs for a surface unit-cell structure in which the triplets of surface As dimers are ``rumpled'' and the second layer (Ga) atoms relax in both the in-plane and perpendicular directions. The effect upon the fit of tilts and twists of the As dimers has been studied by imposing small displacements on the dimerized surface As atoms away from the best-fit configuration. We find evidence to suggest that the As dimers are symmetrical to within possible tilt angles of ensuremath{sim}1ifmmode^circelsetextdegreefi{} and/or twist angles of ensuremath{sim}1ifmmode^circelsetextdegreefi{}." @default.
• W2086143743 created "2016-06-24" @default.
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• W2086143743 date "1993-08-15" @default.
• W2086143743 modified "2023-09-25" @default.
• W2086143743 title "Multiple-scattering evaluation of RHEED intensities from the GaAs(001)2×4 surface: Evidence for subsurface relaxation" @default.
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• W2086143743 doi "https://doi.org/10.1103/physrevb.48.4721" @default.
• W2086143743 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/10008957" @default.
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