The use of layered, 2D perovskites can improve the stability metal halide perovskite thin films and devices. However, charge carrier transport properties in layered are still not fully understood. Here, sum electron hole mobilities (??) PEA2PbI4, through transient electronically contacted nanosecond-to-millisecond photoconductivity measurements, which sensitive to long-time, long-range (microme...