2D CUF Models are based on to Principle of Virtual Displacements (PVD) and Reissner Mixed Variational Theorem (RMVT). A brief overview of the 2D CUF can be found here, including theoretical overviews and numerical examples. Some results of the 2D CUF model capabilities can be found here. Different application have been developed with particular attention given to multi-field analysis and multi-layered structures.