  By properly generalizing Nozie`res' Fermi liquid theory, we construct an
Hamiltonian approach to the scattering of conduction electrons off a spin-1/2
impurity in the ovescreneed Kondo regime, as T -> 0. We derive the S-matrix at
the interacting fixed point, and the corresponding phase shifts, together with
leading energy corrections to the unitary limit. We apply our results to obtain
the low-temperature dependence of the 2-channel Kondo conductance, and we
relate it to possible transport experiments in a Quantum Dot
