See how you can use the Displace filter to help composite layers blend with each other
Important Note: Layers that are pure black will usually not appear with the "Blend" screen mode. The text in this video has gaussian blur and displace filters which make the black text blend successfully.
If you are using rasterised pixel layers with the "Screen" blend mode and they are not blending very well, you can add a Curves or Levels adjustment to alter the tone and make the blend more visible.
See a full list of official tutorials at affin.co/PhotoTuts
Photograph by James Ritson.