Paper is jagged <at/on> <a/the> microscopic level

Krybro

Senior Member
Polish
Which version should I use?
1) Paper is jagged at a microscopic level.
2) Paper is jagged at the microscopic level.
3) Paper is jagged on a microscopic level.
4) Paper is jagged on the microscopic level.

I would use 2, but I am not sure at all. Thanks :)
 
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