Hi A_J_123 -
As far as I know, there's no "Duotone" effect built into PDR. There's one called "Half Tone", which creates a spotty image with two colours.
If you have ColorDirector, you can easily generate the effect using Split Toning.
Here's one I just made as a preset. That can be downloaded & installed in PDR. You'll find it under Fix/Enhance > Color Presets.
Duotone effects are also available in Pixelan's
Film Touch 2 Pro, which you can purchase as a separate plug-in for PDR.
Sorry my suggestions can only offer solutions outside PDR.
Cheers - Tony
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