It is shown to what extent the phase of a reflection coefficient may be determined from a single x-ray reflectivity experiment. Complex calculus guarantees that the so-called ``phase problem'' is relaxed for certain situations and the reflection coefficient is only determined by its moduls. A procedure to reconstruct the phase from a single measurement under incorporation of preknowledge of the system is derived and tested by numerical examples.
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Zimmermann et al. (2000) studied this question.
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