Changes in conductance of a P delta layer in a perpendicular
magentic field. From top to bottom, T=0.596, 1.00, 1.55, 2.80,
5.00, 8.04, 11.5, 15.1, and 19.0 K. When the temperature increases,
phase coherence length decreases, and the transition to lnB
dependence shifts to higher fields.
