For materials with natural fillers, there can be observed a peak approximately at the same 2θ angle position of the peak of the corresponding clay powder (for both MMT and bentonite). This indicates poor dispersion, where separation of clay layers had failed, and confirms the findings of SEM. Nanocomposites with modified fillers show peaks at lower 2θ angles than the corresponding nanoclay powder demonstrating intercalation of the layers. This result coincides with the observations from SEM images.