Low-temperature magnetotransport properties of the 2D δ -layers as a function of temperature. Figure 3a shows the phase coherence length as calculated from Hikami fitting while 3b shows the mobility trend. The phase coherence length is dominated by Nyquist dephasing, resulting in a T -0.5 dependence, shown in 3a. In this regime the mobility is dominated by weak localization and electron-electron interactions, resulting in a net ln(T) dependence as indicated in 3b. Importantly, the temperature dependence of the mobility and phase coherence length is almost identical for both samples indicating that neither metallization is limiting the thermal equilibrium of carriers.