For each of these structures, the molecular Hessians were calculated, in which the relevant amide I modes were identified and subjected to a localization, which provides local modes For comparison, the local mode frequencies and coupling constants were calculated using vibrational exciton models. In particular, we applied three different vibrational frequency maps (Jansen , Skinner , and Tokmakoff ) in combination with the GLDP map for nearest-neighbor shifts . For the coupling constants, we employ Jansen's GLDP map for the nearest-neighbor couplings and the TDC model of Torii and