a lot less. we're talking ~2 microns (ie: 2 micrometers or 0.002mm). For context, the width of an "average" human hair ranges from 18 to 180 microns (there's a lot of variability due to age, ethnicity, and lifestyle).

If you want to see for yourself, you can dissolve the aluminum to leave just the lining (scrub any paint off the outside of the can first). You can use a solution with pH either lower than 3 or higher than 12.5. For context, draino is about 12 on the pH scale, and coca-cola is about 2.5, but the closer you are to neutral, the longer it will take (so while you could theoretically use the soda inside the can, that will take quite a while). There are sulfuric acid drain cleaners that get down into the 1 to 2 pH range (though note that pH is a log scale, so that's on the order of 10 to 100 times more acidic than the cola and will fuck your shit up if you aren't careful).

For whatever you choose to use, be sure to look up safe handling and disposal recommendations before attempting, or simply watch this youtube video instead!