1. University of Oxford, Department of Materials, Parks Road, Oxford OX1 3PH, U.K.
2. SuperSTEM
Laboratory, SciTech Daresbury Campus, Keckwick Ln, Warrington WA4 4AD, U.K.
3. National
Center for Electron Microscopy, Molecular Foundry, Lawrence Berkeley National Laboratory, 67 Cyclotron Road, Berkeley, California 94720, United States
4. University of Sheffield, Department of Materials Science & Engineering, Immobilisation Science Laboratory, Mappin Street, Sheffield S1 3JD, U.K.
5. School
of Engineering, University of Liverpool, Brownlow Hill, Liverpool L69 3GH, U.K.
6. Materials Science & Technology Division, Oak Ridge National Laboratory, 1 Bethel Valley Road, Oak Ridge, Tennessee 37831, United States