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Yes - but currently only stacks managed by the same backend can use StackReference to reference each other. 

does ‘same backend’ mean same bucket, or bucket and path?

I’m just trying this out, and currently have `$BUCKET/infra/.pulumi` and `$BUCKET/app/.pulumi` - is StackReference not supported in that layout?

fwiw, I’ve run straight into this - <https://github.com/pulumi/pulumi/issues/2814#issuecomment-512723246>

Yes - this is something we plan to address as part of <https://github.com/pulumi/pulumi/issues/2522>. 

<@UB3BGTV63> what’s the syntax for the StackReference stack name when using S3? From this ticket it looks like it should be `projectname/stackname`, but it only works for me if it’s just `stackname`
<https://github.com/pulumi/pulumi/issues/2814>

Yes - re-reading these issues - I believe you are right that StackReference across stacks in the S3 backend will not work currently until <https://github.com/pulumi/pulumi/issues/2522> is addressed.

fwiw this is a huge gotcha for the S3 backend - it takes all of this off the table <https://www.pulumi.com/docs/intro/concepts/organizing-stacks-projects/#micro-stacks>