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Using Concentric in Repeater
Concentric in the Repeater is used to create round or polygonal patterns.
Again the "Edit More Repeater Options" button offers advanced settings,
of course the available parameters will differ slightly.
The halftone effect is available again and can be found in the
"Adjust" dropdown menu. Then use Scale in "Edit Adjustment".
This time, you should select a round grayscale gradient.
As usual, let the shapes overlap slightly here to create a nice effect.
Sometimes there appeare Artefacts, unwanted Shapes in the Result.
Just do a "Expand Appearance" and a "Break apart", delete the Artefacts
and do a Boolean Combine to get a Result without Artefacts.
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Video using Concentric in Repeater
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