I'm just wondering something. Suppose some particles scatter light coming from a monochromatic laser or just some monochromatic light source. I've seen Rayleigh scattering being described as if the particles reemitted light that either added together in phase in the forward direction or was randomly out of phase in the perpendicular direction so that it could possibly cancel out. But what I wanted to know is is this reemitted light in phase with the laser light or 180 degrees out of phase with the laser light in the forward direction. That is in the forward direction does the reemitted light very slightly add to the laser light or very slightly cancel it as you move forward through the material? Thank you.