  We present theoretical study of electronic structure (spectral functions and
Fermi surfaces) for incommensurate pseudogap and charge density wave (CDW) and
commensurate CDW phases of quasi two dimensional diselenides 2H-TaSe2 and
2H-NbSe2. Incommensurate pseudogap regime is described within the scenario
based on short-range order CDW fluctuations, considered within the static
Gaussian random field model. In contrast e.g. to high-Tc cuprates layered
dichalcogenides have several different CDW scattering vectors and electronic
spectrum with two bands at the Fermi level. To this end we present theoretical
background for the description of multiple scattering processes within multiple
bands electronic spectrum. Thus obtained theoretical spectral functions and
Fermi surfaces are compared with recent ARPES experimental data, demonstrating
rather good qualitative agreement.
