Transport properties of KxC70 thin films doped to their maximum conduc
tivity are studied. At this doping level, KxC70 (nominally K4C70) is c
haracteristic of a disordered metal with room-temperature conductivity
close to 600 S/cm. The conduction bandwidth is estimated as 0.5-0.6 e
V. The thermopower and magnetoconductance data are similar to those of
K3C60 and intercalated carbon materials. No superconducting transitio
n is observed above 1.35 K.