in article %YRtd.7047$Ya4.4814@edtnps84, NSM at wrote on
12/8/04 10:07 PM:

It's not Litz wire, it's about 20# wire wound Litz fashion. It's two or
three layers and it looks like the primary? Actually 1/4 is a tad large, 1/8
might be closer, but I've never seen multiple strands used on a SMPS like
this.
Although it is not clear from you description, there are ways of winding
coils to minimize stry capaciatance.

Bill