How conductive is aluminized mylar?
I cut a 2 cm square out of a mylar 'space blanket', and placed my digital multimeter probes flat on either side to measure resistance from one side to the other. The reading (on the 200 Ω scale) was 1.8 Ω.
The sheet thickness was ~0.01 mm (ten layers measured 0.11 mm on my digital calipers). It is only metallized on one side.