# Desired number of `layers`
	#
	# This attribute must be assigned before any call to `layers` or `[]`.
	#
	# By default, it is the highest integer under the logarithm base 2
	# of `amplitude`, or 4, whichever is the highest.
	var n_layers: Int = 4.max(amplitude.abs.log_base(2.0).to_i) is lazy, writable