Fig. 3: Characterization of cross-section of a rectangular I-APT sample in close proximity to PFA in 0.6 M NaCl for 28 days.

a A SEM image of the entire cross-section. b A SEM image of a selected area right above the I-APT/PFA crevice mouth area. c EDS elemental maps of a selected area as indicated in the blue box. b, c Share the same scale bar.