Hi All,
Found an article on Litz-wire. On first scan it appears to give
calculations and graphs on stranding number vs gauge vs AC resistance
vs DC resistance. It contains a 27 references to previous works on
skin-effect and eddy-current papers.
Optimal Choice for Number of Strands in a Litz-Wire Transformer
Winding
by Charles R. Sullivan
IEEE Transactions on Power Electronics, Vol. 14, No. 2, March 1999,
Pages 283 to 291