A.c. photoconductivity (&Dgr;&sgr;) and depolarization current measurements on amorphous films ofGaAswere performed. The following results were obtained: the a.c. photoconductivity is a sum of three components: two photoconductive, with different time constants and a transient thermal component. The depolarization curve as a function of temperature showed two broad maxima. From these results information about the localized levels in a‐GaAswere obtained.