Figure 2.

Parameters for the calculation of the resistivity and Hall coefficient for the double-layered samples. Shorthand notations for the parameters of the initial PbTe film and the double-layered structure of porous PbTe layer on top of the unmodified PbTe film after anodic electrochemical treatment for the analysis of the resistivity and Hall coefficient change during pore formation. d_init, initial thickness; ρ_init, resistivity of the initial lead telluride films; R_{H init}, initial layer Hall coefficient; d_por, thickness of the porous layer; ρ_por, resistivity of the porous layer; R_{H por}, porous layer Hall coefficient; d_un, thickness of the underlying layer.