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Thanks..

Also, the attached shows that the "law" that Zout of the SMPS input filter

should be more than 10x lower than the SMPS Zin is not even accurate.

The attached shows an SMPS with a crossover of 6700Hz. At up to

6700Hz, its Zin is -3.42 Ohms. The Zout  of the shown input

filter is 0.56 Ohms at the crossover, and yet there is no instability.

The attached  LTspice sim confirms this.