A new kind of X-ray microscopy can visualize single-unit-cell steps on a crystal surface. This is an order of magnitude better depth-resolution than current X-ray microscopes can achieve.
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Pogany, A. A small step to higher resolution. Nature Phys 2, 657–658 (2006). https://doi.org/10.1038/nphys431
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DOI: https://doi.org/10.1038/nphys431
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