  Using atomic force microscopy, we have studied the surface structures of high
quality molecular beam epitaxy grown (Ga,Mn)As compound. Several samples with
different thickness and Mn concentration, as well as a few (Ga,Mn)(As,P)
samples have been investigated. All these samples have shown the presence of
periodic ripples aligned along the $[1\bar{1}0]$ direction. From a detailed
Fourier analysis we have estimated the period (~50 nm) and the amplitude of
these structures.
