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J.M.O.Z. acknowledges the hospitality of the Institute for Physical Science and Technology, University of Maryland, where part of the manuscript was prepared.We consider a horizontal fluid layer between two rigid boundaries, maintained in a stationary thermal nonequilibrium state below the convective Rayleigh-Benard instability. We derive an explicit expression for the nonequilibrium structure factor in a first-order Galerkin approximation valid for negative and positive Rayleigh numbers R up to the critical Rayleigh number R(c) associated with the appearance of convection. The results obtained for rigid boundaries by the Galerkin-approximation method are compared with exact results previously derived for the case of free boundaries. The nonequilibrium structure factor exhibits a maximum as a function of the wave number q of the fluctuations. This maximum is associated with a crossover from a q(-4) dependence for larger q to a q(2) dependence for small q. This maximum is present at both negative and positive R, becomes pronounced at positive R and diverges as R approaches the critical value R(c).engBoundary effects on the nonequilibrium structure factor of fluids below the Rayleigh-Benard instabilityjournal articlehttp://dx.doi.org/10.1103/PhysRevE.66.036305http://journals.aps.org/open access536Stationary Heat-FluxConvective InstabilityTemperature-GradientThermal-EquilibriumLight-ScatteringSteady-StateHydrodynamic FluctuationsBrillouin-ScatteringDiffusion-ProcessesGiant FluctuationsTermodinámica2213 Termodinámica