Abstract
The theory of satellite reflections based on the modulation of occupation probability is summarized. According to the theory, which can well explain the whole extinction rules of satellite reflections of intermediate plagioclase, the superstructure is interpreted as the periodic antiphase domains, constructed by two structure elements ρ1 and ρ2. The structure-factors for main and satellite reflections are expressed as Fmain ∝F1 +F2 and Fsat∝F1-F2, respectively, where F1 and F2 are the Fourier transforms of ρ1 and ρ2.
