Number of boundary layers in CFD Hex-Dominant mesh

Dear all, 

 

I have a problem when deciding on how many layers I should add after the first boundary thickness layer. I want to study when y+ = 1, and with a growth ratio of 1.2 (usually used). 

 

How can I perform this in 3DExperience? Of what i understand, the program itself computes the growth ratio...

 

Thank you for any inputs. 

 

Best regards, 

Jennifer Rosén