Cecil, W5DXP wrote:
"Does this cause and effect chain of events result in aphase lag between
electric and magnetic fields?"

Never saw a phase lag suggested. As radiation impedance is a resistance
even in free space, I expect rise and fall in electric and magnetic
fields is simultaneous even as they speed away at the velocity of light.
Which came first, the electric or the magnetic?

Best regards, Richard Harrison, KB5WZI