Most brake discs are 2mm thick, some are a bit thicker at 2.3mm. Tektro and Shimano rotors have a minimum service thickness around 1.5 to 1.6mm. I would just use that as a fairly solid metric to judge any other bicycle rotor by.
I have a set of Buckloos floating discs for my bike when I wear out my current rotors. 203mm front and rear on my bike, because why not.
It was nice, not top of the line. Sold it because could only go 37 miles with just using throttle w/o pedaling. An extra batt at that time was $1300, not willing to pay that so sold it. 52V 19.5 ah battery. That battery is now selling for $599. If I ever get another one a second battery cost will be factored in when buying. Maybe someday, another m/c is on my bucket list 1st though before I get too old to safely ride one.
Finally found a couple of spare minutes to take 2 pics of the disk rotor I removed from the front wheel of my bike.
You will readily be able to see why I did not need a micrometer to measure the runout on my disk rotor...lol...The ridge right after the top holes on both sides are quite visually noticable and pronounced to preclude any other thought but to replace it, which i did of course and brakes are working as they should once again...lol...My runout has run out...lol...