**Acknowledgments**

We gratefully acknowledge Gal Radovski for assisting with the HRSEM microscopy analysis. We gratefully acknowledge the support of the ERC project *INTIF* 226639, ITN *MoWSeS* 317451, the Israel Science Foundation, the COST action *COINAPO* MP0902, the FTA project of the Isr. Natl. NanoIntiative; the G.M.J. Schmidt Minerva Center for supramolecular chemistry; the Harold Perlman and the Irving and Azelle Waltcher Foundations, and the Irving and Cherna Moskowitz Center for Nano and Bio-Nano Imaging. R.T. is the Drake Family Chair in Nanotechnology and director of the Helen and Martin Kimmel Center for Nanoscale Science.
