I have just found a dead Dragon Fly and noticed the wings are so thin! Does anyone know the actual thickness.?

They sure are thin matey!

Answers:
I found this paper that said it is betwen 1.7 and 3.71 micrometer (more or less 0.002 - 0.004 millimeters) depending on what part of the wing:
Fig. 7 shows the thickness of the membrane at various
locations around the wing. The mean membrane thickness of
all the test specimens in the anal fan was 1.70±0.85 um,
whereas the mean thickness in the remigium was 3.71±1.18 um
(means ± S.D., N=22 (anal fan); N=13 (remigium)). Membrane
material from the anal fan is therefore both less stiff and
thinner than material from the remigium.
You can see pictures and the complete paper here:
http://jeb.biologists.org/cgi/reprint/20.
0.123489756489mm
half a nanometer
Your average human hair is 0.03mm so I suppose you could compare the two and make a guess.
=might be a bit thinner
measure it you have it with you
The site below has lots of info

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