Some tape measurements, with a micrometer and digital calipers. Measuring tape is not like measuring metal; the measurements are approximate, but pretty close.
Velox: 0.58-0.60mm
Schwalbe plastic (urethane?) rim band: 0.49mm
Schwalbe High Pressure Fabric Rim Tape: 0.27mm
Generic plastic rim band: 0.52mm
Scotch 898 filament tape: 0.15mm
Nashua 357 duct tape: 0.35mm
Polyken duct tape: 0.24mm
Scotch 33 electrical tape: 0.17mm