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TI has a document on Designing Planar Magnetics which you might find informative:
https://www.ti.com/download/trng/docs/seminar/Topic4LD.pdf
https://www.ti.com/download/trng/docs/seminar/Topic4LD.pdf
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However, in inductors and flyback
transformers using gapped centerlegs, the
winding configuration often results in greater
AC winding loss.
Bifilar windings approach the ideal, but this
is usually not possible in a planar transformer,
especially when high voltage isolation is required.