  We present here a reciprocal space formulation of the Augmented space
recursion (ASR) which uses the lattice translation symmetry in the full
augmented space to produce configuration averaged quantities, such as spectral
functions and complex band structures. Since the real space part is taken into
account {\sl exactly} and there is no truncation of this in the recursion, the
results are more accurate than recursions in real space. We have also described
the Brillouin zone integration procedure to obtain the configuration averaged
density of states. We apply the technique to Ni$_{50}$Pt$_{50}$ alloy in
conjunction with the tight-binding linearized muffin-tin orbital basis. These
developments in the theoretical basis were necessitated by our future
application to obtain optical conductivity in random systems.
