How to get HR Director and HR specialist in workflow?

Hi,

I need to send the work item to HR director for approval and then I need send work item to HR specialist for data entry in PA40.

My problem is I dont know the way to identify the HR director and HR specialist. Is the HR director the chief of the HR org unit? While is the HR specialist the lowest level in the org unit?

I m not familiar how HR org unit works. How should I approach this requirement?

Appreciate advice. Thanks.