  Using a scattering technique based on a parametrized linear combination of
atomic orbitals Hamiltonian, we calculate the ballistic quantum conductance of
multi-wall carbon nanotubes. We find that inter-wall interactions not only
block some of the quantum conductance channels, but also redistribute the
current non-uniformly over the individual tubes across the structure. Our
results provide a natural explanation for the unexpected integer and
non-integer conductance values reported for multi-wall nanotubes in Ref.[S.
Frank, P. Poncharal, Z.L. Wang, and W. A. de Heer, Science 280, 1744 (1998)]
