Depending on the production procedure it varies from product to product . In case you need to measure the roughness you can send the plates to our Central Lab.
http://uma.ac.ir/index.php?slc_lang=en&sid=1
As you know roughness is not simply a number but can be more accurately described by a power spectrum density measured as function of the effective wavelength. In other terms polymers usually can be very smooth surface at a given length (let us say below micron scale) and can be quite rough at other characteristic length (tens of microns). As a polymer the roughness depend on the surface treatment, reticulation , molecular weight etc... so yes it is hard to give a number but typically several tens of nm to hundred nm is not unusual.
This depends on the class of material. So you can force PDMS and PMMA to be ultra smooth surface, with simple hot embossing or spin coating.
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