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What were the network rules regarding the difficulty adjustments of the Bitcoin Cash chain, before the first hard fork was implemented on November 13th, 2017? There was a rule that was a function of the time taken to find the last 2016 blocks, and one based on the Median Time of the last 11 blocks. What was the effect of these rules?

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The first rule is well understood.
The second rule, ensures that difficulty gets readjusted quicker if the MTP between blocks is big (12h.)

In practice:
Check the MTP of the current block (mining time of a block 6 blocks earlier)
compare to the MTP time of a block mind 6 blocks earlier
if the difference is 12 hours then difficulty will reset
for example:
block 478574 has an MTP of Aug 1 14:39: UTC
block 478568 has an MTP of Aug 1 11:52 UTC
so not yet 12 hours apart

also see: https://medium.com/@jimmysong/bitcoin-cash-difficulty-adjustments-2ec589099a8e (edit: fixed link)

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