At either very low or very high current densities, a multi-step reaction is expected to behave analogously to a single-step reaction with these apparent values of α and I0. Under such conditions, it is impossible to directly measure the α value for each reaction step, since the same apparent α value can be described by infinitely many combinations of αn. Nonetheless, these equations can still be used to constrain the possible values of αn for each reaction step, which are consistent with the apparent α value. For example, for a two-step reaction with α1 = 0.5 and α2 = 3, the apparent α value would be 3/7 (0.4285).