How to proceed with resistor that is series to the diode in a half wave rectifier circuit?
Often a fast RC product ( time constant) is used to SLOW DOWN the turnon speed.
Slower turnon will reduce the magnetic interference, which depends on

Vinduce = L * dI/dT

and such slow_down_the_turnon is important in the 2,000 volt rectifiers in MicroWave Oven power supplies.
I've chatted with custom_home builders who accept responsibility for success with high_end homes having both regular power wiring AND computer_network wiring AND home entertainment (music, TV) wiring. The biggest problem, for which these builders use special installation guidelines, is appliances (MicroWave Ovens) inducing horrid trash into the computer_network wiring or into the music/TV wiring. If all else fails, they will use special PowerLine filters between the MicroWave Oven and the 110/220 power, to prevent entry of 100 nanosecond Trise spikes from coupling into Computer and music/TV cables.