  The highly anisotropic and qualitatively different nature of in- and
out-of-plane charge dynamics in high-Tc cuprates cannot be accommodated within
the conventional Boltzmann transport theory. The variation of in- and
out-of-plane resistivities with temperature and hole content are also anomalous
and cannot be explained by Fermi-liquid theory. In this study we have proposed
a simple phenomenological model for the dc resistivity of cuprates by
incorporating two firmly established generic features of all hole doped cuprate
superconductors- (1) the pseudogap in the quasiparticle energy spectrum and (2)
the T-linear resistivity at high temperatures. This T-linear behavior over an
extended temperature range can be attributed to a quantum criticality,
affecting the electronic phase diagram of cuprates. Experimental in-plane and
out-of-plane resistivities of double layer Y(Ca)123 have been analyzed using
the proposed model. This phenomenological model describes the temperature and
hole content dependent resistivity over a wide range of temperature and hole
content.
