  We report an experimental study of quantum conductivity corrections in a low
mobility, high density two-dimensional electron gas in a AlGaAs/GaAs/AlGaAs
quantum well in a wide temperature range (1.5K - 110K). This temperature range
covers both the diffusive and the ballistic interaction regimes for our
samples. It has been therefore possible to study the crossover between these
regimes for both the longitudinal conductivity and the Hall effect. We perform
a parameter free comparison of our experimental data for the longitudinal
conductivity at zero magnetic field, the Hall coefficient, and the
magnetoresistivity to the recent theories of interaction-induced corrections to
the transport coefficients. A quantitative agreement between these theories and
our experimental results has been found.
