How is the attractive force between two magnets changed when they are separated by non-metalic solids?

I recently encountered the following practical problem. We have a system of several layers:

1. a neodymium magnet; a disc, dimensions and grade to be determined
2. 1 mm of 925 sterling silver; we can suppose that this is a disc, diameter 15 mm
3. 0.5 mm of paper or tissue (cotton)
4. 1 mm of the same silver disc
5. again, a neodymium magnet

How can I estimate the attraction force between these two magnets in this system based on their dimensions and grade? I found several estimators online (this one, for example) but they all assume that there is nothing between the magnets.

Even being able to estimate “X mm in diameter and Y mm in thickness would yield at least Z grams of pull” would be great.