Abstract
We describe a channeling analysis of the strain associated with ultrathin (2--6 monolayers) epitaxial films of Ge embedded in Si. Measured strains are at the level of 3--4%, exceeding that accessible in bulk materials. These values, in both single-layer films and Ge-Si superlattices, are in approximate agreement with bulk elastic properties suggesting that Poisson's ratio is applicable at the few-monolayer level.
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