Magnetoconductance (MC) measurements have been performed on a 2140 Angstrom
thick tungsten carbide film at temperatures very close to the superconduct
ing transition temperature T-c of the film. The data are dominated by super
conducting fluctuations. A novel three-dimensional phenomenological model i
s proposed to explain the MC data, yielding good fits. The Larkin beta fact
or, beta (Larkin), appeared as a fitting parameter. An expression proposed
by Larkin for beta (Larkin) failed badly for temperatures extremely close t
o T-c. But at intermediate and high temperatures compared to T-c, Larkin's
expression gave very good agreement in fits to the MC data. At temperatures
very close to T-c, a crossover from three dimensions to two dimensions was
observed in the behaviour of the MC of the film.