FreeWIFI:
The slide of Dr Rivas was not intended to reveal a "reference" design, but was part of a presentation.
Here is a link to a more relivant conference:
http://power.eecs.berkeley.edu/pels/seminars/SUPERLAB_highlights_Nov15_Berkeley_handout.pdfa/ Rivas is a respected power electronics researcher on a level with Dr Lee at VPI, and Dr Cuk.
b/ planar magnetics is long well known, suggest to research texts, papers and references.
They are most effective at freq 1-200 MHz.
c/ The "credit card" HV PS in the photos was a demonstration of the principles discussed and not meant as a design example.
d/ précise your goals, we shall respond better eg build HV PS xx kV yy ma input zz V OR build planar transformers to learn about them.
Bon Chance
Jon