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A 4 mil thickness is four thousandths (0.004) of an inch.
It is approx 4.7 inches.
a mic is 1/1000 of a mil, so it is 1000 times less thick
See this link: http://www.backyardcitypools.com/vinyl-pool-liners/Mil-Vs-Gauge.htm
No. Mils are much smaller than mms.