  Quantum transport phenomena allow experimental assessment of the phase
coherence information in metals. We report quantitative comparisons of
coherence lengths inferred from weak localization magnetoresistance
measurements and time-dependent universal conductance fluctuation data. We
describe these two measurements and their analysis. Strong agreement is
observed in both quasi-2D and quasi-1D AuPd samples, a metal known to have high
spin-orbit scattering. However, quantitative {\it disagreement} is seen in
quasi-1D Ag wires below 10 K, a material with intermediate spin-orbit
scattering. We consider explanations of this discrepancy, with particular
emphasis on the theoretical expressions used to analyze the field dependence of
the conductance fluctuations. We also discuss the mechanism of the suppression
of conductance fluctuations at high drive levels, and dephasing mechanisms at
work in these systems.
