c1 Refereed Journal Article, LL 3.4.14.
Green in Sherpa: Author's Pre-print:   author can archive pre-print (ie pre-refereeing) 
Author's Post-print:   author can archive post-print (ie final draft post-refereeing) 
Publisher's Version/PDF:   author cannot archive publisher's version/PDF 
General Conditions: •Author's pre-print on pre-print servers such as arXiv.org
•Author's post-print on author's personal website immediately
•Author's post-print on any open access repository after 12 months after publication ...
Requested (Xu) accepted v & Permission 23.9.1.4-MMM