Resistivity
Related to resistance, resistivity has a length component, giving the resistance per unit length. This resistivity in semiconductor materials changes dramatically depending on the doping level.
Resistivity, ρ (or rho), has units of ohms-cm, and is the primary parameter used to distinguish among insulators, conductors, and semiconductors.
Microelectronic Circuit Design, 4th Edition by Richard C. Jaeger & Travis N. Blalock