  A pair of sequences is called a Z-complementary pair (ZCP) if it has zero
aperiodic autocorrelation sums at each of the non-zero time-shifts within {a}
certain region, called the zero correlation zone (ZCZ). ZCPs are categorised
into two types{:} Type-I ZCPs and Type-II ZCPs. Type-I ZCPs have {the} ZCZ
around the in-phase position and Type-II ZCPs have the ZCZ around the end-shift
position. {Till now only a few} constructions of Type-II ZCPs are reported {in
the literature}, and all {have} lengths of the form $2^m\pm1$ or $N+1$ where
$N=2^a 10^b 26^c$ and $a,~b,~c$ are non-negative integers. In this paper, we
{propose} a recursive construction of ZCPs based on concatenation of sequences.
Inspired by Turyn's construction of Golay complementary pairs, we also propose
a construction of Type-II ZCPs from known ones. The proposed constructions can
generate optimal Type-II ZCPs with new flexible parameters and Z-optimal
Type-II ZCPs with any odd length. In addition, we give upper bounds for the
PMEPR of the proposed ZCPs. It turns out that our constructions lead to ZCPs
with low PMEPR.
