  We apply a field-theoretical approach to study the structure and
thermodynamics of a two-Yukawa fluid confined by a hard wall. We derive mean
field equations allowing for numerical evaluation of the density profile which
is compared to analytical estimations. Beyond the mean field approximation,
analytical expressions for the free energy, the pressure, and the correlation
function are derived. Subsequently, contributions to the density profile and
the adsorption coefficient due to Gaussian fluctuations are found. Both the
mean field and the fluctuation terms of the density profile are shown to
satisfy the contact theorem. We further use the contact theorem to improve the
Gaussian approximation for the density profile based on a better approximation
for the bulk pressure. The results obtained are compared to computer simulation
data.
