The specific capacitance of each layer can be determined based on the relative permittivity of each layer, obtained from the steady-state model, while the ionic conductivity of each layer is related to both ionic concentration and the mobility of ions within that specific layer. As demonstrated in the steady-state modeling, ion concentration varies significantly across different regions of the interface. In regions of high ionic concentration, the intense local electric field and reduced intermolecular spacing lead to a decline in the number of free ions available for conduction, as short-range interactions become increasingly significant . Additionally, ion mobility is further reduced due to ion-ion collisions and other short-range interactions . Consequently, the resistance to ion transport rises sharply, leading to a decrease in conductivity with increasing ion concentration.(more information is provided in SI section 2.1)