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Diffraction of 1.5406 angstroms X-rays from a crystallographically oriented (epitaxial) relaxed bilayer consisting of AIAS and GaAs yields two closely spaced overlapping peaks. The

Diffraction of 1.5406 angstroms X-rays from a crystallographically oriented (epitaxial) relaxed bilayer consisting of AIAS and GaAs yields two closely spaced overlapping peaks. The peaks are due to the (111) reflections from both films. The lattice parameters are a(AIAS) = 5.661I angstroms and a (GaAs) - 5.6537 angstroms. What is the peak separation in degrees?

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