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Approximate translation of screened spherical waves.

We develop and discuss a Taylor-series expansion of the addition theorem for screened spherical waves, i/sup l/h/sub l/(kr)Y/sub lm/(r). The expansion is designed for orderly progression in the addition of curved--wave-front corrections to multiple scattering of electrons in solids, but it applies to any wave-scattering problem based on the addition theorem for spherical waves. We relate one of the expansion indices to a magnetic quantum number in a coordinate system rotated to align the quantization and translation axes.