Jim Kelley wrote:
But it is
certainly possible that P1, or P2, or both never existed. Particularly
the latter, if the fields happen to be co-located in space and are at
every point equal in magnitude and opposite in phase.

You cannot have it both ways, Jim. Either the reflections
existed or they they never existed. Please tell us why
and how a physical impedance discontinuity with a reflection
coefficient of 0.707 avoids causing reflections (in violation
of the laws of physics).
--
73, Cecil http://www.w5dxp.com