[s0rce]

Correct, this paper demonstrated that the Pb doesn't move around too far that it would invalidate the previous measurements. This was done using atom probe tomography.

Source: I know John and also do atom probe work.

Also, It was accepted at the end of last year and took a bit to publish, not unusual.

[jofer]

On a side note, JV is one of the most universally respected scientists I've seen. (JV --> John Valley, for various reasons everyone at Wisconsin calls him "JV".)

He's an absolutely huge name in the field, and actually treats his students/postdocs very well. He expects a lot in return, but he really does look out for people.