pkienzle/periodictable — pull request #11 by bpedersen2 (2014-09-05 15:11:18+00:00)
Title: Implement a layer syntax for chemical formulas

The layers are implicitly converted to volume fractions and mixed.

Layer syntax:
[7nm Fe // 10nm Ni]5 // 1mm Si

accepted units:
nm/um/mm
The group syntax is optional

The main usage will be calculating activation for multilayer systems