X-Ray Standing Wave Location of Cl and S on Cu(001)

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The 8X8 matrix representation of dynamical x-ray diffraction theory provides a fast, precise and easy way to compute standing wave fields from Bragg planes both parallel and oblique to a crystal surface. We use this method to show that when Bragg angles are very close to 90degrees the diffraction profile of monochromatic x-rays is very broad and distorted.