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@@ -164,6 +164,10 @@ wiggeRundfunktechnischesHandbuch1930}.
 
 \subsection{Twisted Inductors in RFIC Design}
 
+The simplest twisted inductor as shown below with $k=1$ inversion corresponds to the counterwound scheme that is
+commonly used for two-layer planar inductors, and which has been used with planar coils for more than a
+century\cite{flemingPrinciplesElectricWave1}.
+
 \subsection{Inductive Wireless Power Transfer in Practice}
 
 Inductive WPT has been proposed in a large number of scenarios, each of which comese with a set of