Optical transmission and transmission electron microscopy studies of epitaxial graphene structures grown on the carbon terminated face of 4H-SiC(000-1) on-axis substrates are presented. Several samples obtained using different growth conditions were studied. Optical microscope showed regions of micrometer size with different layer number. The exact number of layers was obtained from transmission electron microscope studies. Optical transmission spectra showed no wavelength dependence and allowed us to obtain the average number of graphene layers.