  We have unveiled coherent multiphoton interferences originating from
different quantum paths taken by the Auger electron induced by a high-intensity
x-ray/XUV pulse under the presence of a strong optical field. These
interferences give rise to a clear signature in the angle-resolved Auger
electron spectrum: an asymmetry with respect to the energy of the Auger decay
channel. In order to illustrate this effect we have considered the resonant
Auger decay of the transition $2p^{5} \!\leftrightarrow\! 1s^{-1}2p^{6}$ in
Ne$^{+}$. The simulations show that these interferences are very sensitive to
the parameters of the x-ray and optical fields.
