Microscope slide The micro images will be printed in microscope slides like this one. This slide is 60 mm x 26 mm, however, the actual images will not be larger than 1 mm x 1mm. The thickness of this slide is around 0.2 mm, i.e. about twice as thick as an average human hair. Titanium (Ti)/gold (Au) coating The slides are coated with a very thin metal film. In this example the metals were titanium and gold. Only the gold layer is visible, however, the titanium is necessary to