  Spectrum of boson fields and two-point correlators are analyzed in a quantum
bar system (a superlattice formed by two crossed interacting arrays of quantum
wires), with short range interwire interaction. The standard bosonization
procedure is shown to be valid, within the two wave approximation. The system
behaves as a sliding Luttinger liquid in the vicinity of the Gamma point, but
its spectral and correlation characteristics have either 1D or 2D nature
depending on the direction of the wave vector in the rest of the Brillouin
zone. Due to interwire interaction, unperturbed states, propagating along the
two arrays of wires, are always mixed, and the transverse components of the
correlation functions do not vanish. This mixing is especially strong around
the diagonal of the Brillouin zome, when tranverse correlators have the same
order of magnitude as the longitudinal ones.
