Before revision:  As an example, we applied the method for mixed monolayers with different proportions of distearoylphosphatidylcholine (DSPC) and dimyristoylphosphatidylcholine (DMPC ) and obtained the excess dipolar density, which were in agreement with those obtained from surface potential measurements .
After revision:  As an example, we applied the method for mixed monolayers with different proportions of distearoylphosphatidylcholine (DSPC) and dimyristoylphosphatidylcholine (DMPC ) and obtained the excess dipolar density, which were in agreement with those obtained by surface potential determinations .