Extending the model of transient permeation through the reactive barrier film presented in part I of this series to two-layer reactive-passive barrier structures, we devote part II to the analysis of the evolution of interfacial Solute concentrations between the layers. The concepts developed earlier are applied to the transient ingress analysis of two-layer films where one of the layers contains a noncatalytic solute scavenger. In particular, we show that for reactive-passive films, the averaging approximation of the transient interfacial Solute concentration provides good agreement with numerical results for the transient effective flux. The applicability range of this averaging and the error introduced by it are quantified. For the passive-reactive films, the same averaging fails to predict the effective flux dynamics. Anew method of ingress analysis is presented for such structures to correct the situation. The method is based on the effective flux dynamics in the homogeneous reactive membrane and the dynamic reactive to the passive-reactive flux scaling between the initial and final solute concentration profiles corresponding to the scavenger activation and scavenger exhaustion times. (c) 2006 Wiley Periodicals, Inc.