Validation of the inverted adsorption structure for free-base tetraphenyl porphyrin on Cu(111) - Ryan,PTP; Lalaguna,PL; Haag,F; Braim,MM; Ding,P; Payne,DJ; Barth,J; Lee,T-L; Woodruff,DP; Allegretti,F; Duncan,DA (CHEMICAL COMMUNICATIONS, 2020)