Schematic view of the proposed geometry for thermal and bulk Comptonization regions in a source hosting a BH with power-law-like emission at high energies. The bulk Comptonization plus thermal spectrum (bulk BMC1 plus thermal BMC2) arise in the innermost part of the transition layer (TL), where the disk blackbody-like seed photons are (thermally and dynamically) Comptonized by the infalling material.