We have found a novel form of ordering in Al0.5In0.5As and (Ga,Al)0.5In0.5As as grown on (001) substrates by molecular beam epitaxy (MBE). Electron diffraction patterns reveal a four-fold periodicity along the  direction as well as the more usual two-fold periodicity along 〈111〉 directions. The morphology of the latter type of ordering is also different from its normal form. © 1993.
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