What is the most accurate way to calculate the charge-transfer resistance (Rct) at the interface between the ISM and the underlying conductor from the EIS curve?
As Ioannis Samaras mentioned, equivalent circuit model (ECM) fitting would be the most appropriate method. However, you better measure the impedance as a function of numerous parameters that will enable you to identify each of the polarization processes, its time constants, and their physical significance.
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