Big Endianness vs Little Endinness in multi word objects

Question

I know difference between Big Endianness and Little Endianness in single word(4-bytes) variables such as Int32. I want to know If we have multi word variables or object (e.g. two word variable Int64) with the following data in Little Endianness format:

----------------->
Lower Memory Address to Higher Memory Address
b0 b1 b2 b3 |b4 b5 b6 b7 (b means byte)
word0       |word1

Which of these below structures is the way that Big Endianness will store it in memory? (Our memory is 32 bit bandwidth and byte addressable, word accessible and architecture is MIPS) structure 1:

----------------->
Lower Memory Address to Higher Memory Address
b3 b2 b1 b0 |b7 b6 b5 b4
word0       |word1

structure 2:

----------------->
Lower Memory Address to Higher Memory Address
b7 b6 b5 b4 |b3 b2 b1 b0
word0       |word1

Answer 1

As I asked a professor, it seems like structure1 is the right answer.