With the assumption of complete incoherence of single electron transpo
rt along the c-axis, it is argued that it takes place by coherent hopp
ing of singlet pairs that are fermionic in character. This will lead t
o a correction to the 1/T c-axis resistivity calculated by Anderson et
al.(6) The c-axis resistivity coming from this extra channel of trans
port is shown to have the same temperature dependence as the inplane r
esistivity (linear in T) and mildly sensitive to the inplane carrier c
oncentration through the modification of the density of states at the
fermi surface. It is argued that the resistivity due to transport in t
his extra channel will be very sensitive to the c-axis disorder and sh
ow an upturn at low temperatures due to c-axis disorder and scattering
by acoustic phonons.