* Corresponding authors

^a Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
E-mail: HBluhm@lbl.gov

^b Peter-Grünberg-Institut PGI-6, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany

^c Julius -Maximilians-Universität Würzburg, Sanderring 2, 97070 Würzburg, Germany

^d Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
E-mail: CSFadley@ucdavis.edu

^e SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, CA 94025, USA

^f Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA
E-mail: ZLiu2@lbl.gov

^g State Key Laboratory of Functional Materials for Informatics, Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China

^h Department of Physics, University of California Davis, Davis, CA 95616, USA

ⁱ Engineering Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA