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Recently we formulated a 2D hybrid stress element from the 3D Hellinger-Reisner principlefor the analysis of thick bodies that are symmetric to the thickness direction. Polynomials have typicallybeen used for all the displacement and stress fields. Although the element predicted the dominant stressand all displacement fields accurately, its prediction of the out-of-plane shear stresses was affected by thevery high order terms used in the polynomials. This paper describes an improved formulation of the 2Delement using Fourier series expansion for the out-of-plane displacement and stress fields. Numericalresults illustrate that its predictions have markedly improved.