Development of a spinodal decomposition model for the example of a heterostructure based on silicon carbide polytypes

The transition region of a 3$C$-SiC/4$H$-SiC heterostructure constituted by layers of the 3$C$ and 4$H$ polytypes has been studied. A previously proposed spinodal decomposition model was used to estimate the thickness ratio of 4$H$ and 3$C$ layers in comparison with the image furnished by transmission electron microscopy.