I would like to use the first 34 channels of T1 and second 34 channels of T2 to stack upon each other, 1 channel of T1 and 1 channel of T2 at a time.
after that the rest 21 channels of T1[which has 55 channels] should get concatenated to the resultant
T3 = concat(([T1 of 34 channels ,T2 of 34 channels] one channel at a time), 21 channels  remaining in T1)