Curiosity got me again, so I measured some aluminum foil from the kitchen. It is Alcan brand, so not one of the cheaper ones. To my astonishment it measured .0007” thick. Just to double check, I measured a new piece of BMF New Improved Chrome, and sure enough it measured .0008”.
Now, it must be considered that the BMF is foil + adhesive, but just the same I would never have guessed that kitchen foil is thinner than BMF.