Hello @Sujith , Thanks for posting this query on this forum,
We have hardware designs on our GitHub site, please refer to the below GitHub page. More information can be obtained from Avnet.
There's an active forum for Avnet: Azure Sphere MT3620 Starter Kit V1 and V2,
The Technical Documents section has quite a few hardware designs and PCB documents
If you need more info, you should be able to get help by posting a query on the forums, as shown below.
You may also try the below link for your product implementation.
Please comment in the below section for further feedbacks and comments on this topic.