Ion millingndash;Auger electron spectroscopy has been used to study, for the first time, the chemical widths of rsquo;rsquo;abruptrsquo;rsquo; LPE AlxGa1minus;xAshyphen;GaAs heterojunctions with compositionx=0.43, 0.60, and 0.85. rsquo;rsquo;Abruptrsquo;rsquo; LPE junctions were found to have chemical interface widths of 90ndash;130 Aring;.
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