In the analysis of the ICI method, 8,9 which will be elaborated in section 2.4, 𝑑𝐸 𝑑√∆𝑡 ⁄ is readily obtained. How dE/dC(0,t) can be obtained with the ICI method will be discussed in section 2.4. With both 𝑑𝐸 𝑑√𝑡 ⁄ and dE/dC(0,t) obtainable from the ICI method, the diffusion coefficient can then be calculated from Equation .