Much depends on the PCB surface coating.  If you use PCB's that are coated
with tin/lead in a hot aired solder leveling process, the stencil will not
mate flush with the PCB, and your readings might be a little higher.
If you are using an organic solder preservative, you should be getting a
good mate, and thus print near your stencil thickness depending a bit on
some of the settings on the screen printer.
Electroplated PCB's will also provide a near 1:1 deposit as well.

                                                          Steve A

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