Correction to: Nature Materials https://doi.org/10.1038/s41563-020-0799-0, published online 14 September 2020.

In the version of this Article originally published, Figs. 1 and 2 and Extended Data Fig. 3 contained some errors.

In Fig. 1c,d,e the units of curvature in the y-axes were incorrect as cm–1; they should have been mm–1. In addition, in Fig. 1d the right y-axis tick marks should have been labelled 1.0, 0.8, 0.6, 0.4, 0.2, 0 from bottom to top instead of 0, 0.2, 0.4, 0.6, 0.8, 1.0.

In Fig. 2b,c the left y-axis labels were missing a minus sign and should have been –Δh (nm). In addition, in Fig. 2b the right y-axis tick mark labels 10 and 90 were mistakenly swapped; the labels should have been 90, 10 from bottom to top instead of 10, 90. Finally, in the caption of Fig. 2a the scale bar was mistakenly given as 2 mm; it should have been 1 µm.

In the caption of Extended Data Fig. 3f the scale bar was mistakenly given as 500 nm; it should have been 2 μm.

These errors have now been corrected.