We investigate the effects of impurity (Co) substitution and carrier doping on the anisotropic transport properties of Bi2Sr2CaCu2O8+δ single crystals, focusing on the interlayer charge dynamics. Our analysis shows that the out-of-plane transport in the Bi2Sr2CaCu2O8+δ system is well described by the tunneling (Lawrence-Doniach) model. By carefully reducing the oxygen content, deviation from T-linear in-plane resistivity, which is similar the behavior in Ba2YCu3O7-δ , can be observed. On the other hand, the out-of-plane resistivity monotonically increases with decreasing temperature, showing no correlation with the anomalous in-plane behavior.
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