Stacking with ethrecahnnel

Hello,
regarding stacking and etherchannel 
follow the below network diagram.
Note: r3,r4 are cisco 3750x switches and r4 is hirschmann mach104-20tx-f switch
switch r3 and r6 connected to each other with stacking.
r3 f1/1 interface connected to r4 f1/1 and r6 f1/2 connected to r4f1/2 interface through etherchannel.
how can i achieve physical-redundancy(etherchannel) from r4 to r3,r6  
is it possible to create etherchannel(r4) with two different switch(r3,r6) sources.
is there any specific rules for etherchannel with stacking ?

is it possible to create etherchannel(r4) with two different switch(r3,r6) sources.
Yes it is possible and it's very common you can form an etherchannel to a stack of switches. 
is there any specific rules for etherchannel with stacking ?
Same rule applies:  Maximum of eight etherchannels and all physical link should be of the same speed. 
When configuring etherchannels on a switch stack always remember to think of the stack as a SINGLE LOGICAL SWITCH (and not as a multiple switches that form a stack).

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