(color online) Plots of total electric field and normalized monomer density distributions of the longer and shorter chains versus distance from the grafting electrode for the smeared charge distribution of grafted chains with a grafting density of at . Note that in this figure, the two monomer density distributions are normalized by the condition of with and . In this study, equal numbers of long and short PE chains are uniformly grafted onto the electrode, and the longer chains are twice as long as the shorter ones. Thus .